# Recent content by hotmail590

1. ### Insulating spherical shell prob!

A small, insulating, spherical shell with inner radius a and outer radius b is concentric with a larger insulating spherical shell with inner radius c and outer radius d. The inner shell has total charge +q distributed uniformly over its volume, and the outer shell has charge -q distributed...
2. ### Point Charges

ohh i understand now! thankyou@!!!
3. ### Point Charges

A point charge q1 -4 nC is at the point x = 0.600 m, y = 0.800 m, and a second point charge q2 +6 nC is at the point x = 0.600 m, y = 0. I need to calculate the magnitude of the net electric field at the origin due to these two point charges. |...
4. ### How would I calculate the magnitude of the electric field?

An electron is released from rest in a uniform electric field. The electron accelerates vertically upward, traveling 4.50 m in the first 3 us (microsecond??) after it is released. Part A What is the magnitude of the electric field? How would I calculate the magnitude of the electric field...
5. ### Charged Balls

Then I would believe that both A and D are negatively charged and when placed near eachother they will repel?
6. ### Charged Balls

There is a ball (A) is carrying a uniformly distributed unknown charge(wich may be zero) and an uncharged copper ball (D). A positive test charge (T) experiences highly attraction with ball (A) and (D). What is the nature of the force between balls A and D if they are brought very close...
7. ### Speed of Heartwall in body

would f2 = the given 90 beats and f0 = the given frequency? 1.95x10^6? v = given speed of sound in body 1500 m/s after when i used those , i get an answer that is very very big.
8. ### Speed of Heartwall in body

I used the second equation that you have explained; however this time I get .069227 here is what I did 1500/(1500+Vheart) * 1.95x10^6 = 90 + 1.95*10^6 Am I using the equations incorrectly?
9. ### Speed of Heartwall in body

A sound wave travels at a frequency 1.95 Mhz through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward the sound receiver as the heart beats. The reflected sound is then mixed with the transmitted sound, and 90.0 beats per...
10. ### Ear Damage from a Small Firecracker

So the area is not a circle?
11. ### Ear Damage from a Small Firecracker

Lets say there is a small firecracker that emits 1200 of peak power. What is the peak intensity B in decibels at a distance of 1 m from the firecracker? This is what i have tried: B = 10log(I/Io) I = 1200/pi Since I = power/area and the area is pir^2, pi(1m)^2 Io=( 10^-12...